https://userapps.support.sap.com/sap/support/knowledge/en/2856924
2856924 - HTTP 404 error message when accessing BILaunchPad through SAML Single Sign On | SAP...
Unable to login to SAML-enabled front-end (like BILaunchpad) using SAML Single Sign On Encountering HTTP 404 error message when accessing SAML-enabled...